Wrench



J. MUMFQRD.

WRENCH.

APPLICATION FILED ocT. e, 1919.

QS?. v I Patenteduly 18, W2K

mill JOHN' MUMFORD, OF CHILLICOTH, OHIO.

WRENCH.

Specification of Letters Patent.

Patented July i8, 1922 Application filed October 6, 1919. Serial No4328,697.

To all whom t may concern:

Be it known that I, JOHN MUMFORD, a citizen oi the United States,residing at Chillicothe, in the county of Ross and Sta-te oit' Chio,have invented certain new and useful. Improvements in a ldlrench, ofwhich the following is a specification.

The invention relates to a wrench, and more pargicularly to the class ofpivotal lever actuating` wrenches.

The primary obj ect of the invention is the provision of a wrench ofthis character,

' wherein the jaw members are pivoted together intermediate their ends,and these members are provided with gripping faces on opposite sides ofthe pivotal connection,

so that a piece oi work can be gripped by said Ylaces on either side oftheir pivot con- `grip upon a piece of work and to maintain` thispositive grip in the use of the wrench. A further object ot' theinvention is the provision of a wrench of this character, wherein thesaine can be actuated in congested'places and be readily manipulated asthe jaw members will automatically adjust themselves to the piece otwork to be engaged, thereby on actuating the lever for the handling ofthe work.

A still further object of the invention is the provision oi' a wrench,wherein the jaw members are adjustable, so as to accommodate dilei'entsizes of work, to be gripped thereby in the operation of the wrench. Thewrench in its entirety being of novel construction to assure reliabilityand efliciency in its use.

A still further object of the invention is the provision of a wrench ofthis character,

which is extrenielysimple in construction,

strong, durable and inexpensive to manufacture.

l/Vith these and other objects in view the invention consists in thefeatures of con` struction, combination and arrangement of parts will;be hereinafter fully described, illustrated in the accompanying drawingand pointed out in the claims hereunto appended.

ln the accompanying drawing:

Fig. 1 is a side elevation of a wrench construction in accordance withythe invention with the aw members in position for receivk ing a piece ofwork.

Fig. 2 is a view similar to Fig. 1 showing the jaw members in grippingposition relative to the work.

Fig. 8 is an edge elevation.

- Fig. 4l is a fragmentary elevation looking toward the opposite edgeot' the wrench.

' F 5 is a sectional view on the line 5 5 of Fig. 2. f

Similar reference characters indicate cori'cspondino parts throughoutthe several views in tie'drawing.

Referring to the drawing in detail, the wrench comprising an actuatinglever 10, preferably of the curvilinear shape as is clearly shown inFigures 1 and 2 of the drawing, and constituting at one end portion ahandle 11, while the opposite end portion is bifurcated to form apivotal fork or yoke 12, the portion of the lever 10 contiguous to thefork oi' yoke 12 being provided with spaced apertures or holes 13, inany one of which is adapted to be detachably received a pivot 14, forswingingly connecting thereto a double link 15 for a purpose presentlydescribed.

Swingingly connected to the fork or yoke 12, o1 the lever and to doublelinks 15 are jaw members 16 and 17, respectively, the

n same being of identical construction, yet'one jaw member, namely, themember 16 is of slightly less length than the member l17 and thesemembers are formed with overlapped pivot ears 18, which project fromtheir inner edges intermediate the ends thereof and on which is engagedatransverse pivot 19 swingingly connecting the said jaw members 16 and17 together. The jaw members 16 and 17 are swingingly connected in thefork or yoke 12 and to double links 15 by pivots 20, while formed onsaid jaw meinbers at their inner edges on opposite sides of the pivotears 18are serrated tooth gripping faces 21 and 22 respectively, so thatthe piece of work introduced between the j aw members and the grippingfaces 21 and 2Q on opposite sides of the pivot 19 can be rnily andsecurely gripped by said niembers for manipulating said piece of work.In Figures 1 and 2 there is shown a pipe section Q3 engaged between thegripping surfaces 21 at the outer side of the pivot 19 connecting thejaw members 16 and 17 together.

1t will be apparent that to open the jaw members at the outer side ofthe pivot 19, it is necessary to swing the lever 10 in one direction andon reversed movement a piece of work can be gripped thereby.

Now to swing the jaw members to open position :tor the engagement of apiece of 'work between the gripping surfaces 22 the lever 10 is swung ina direction to close the outer ends of said members 16 and 17, wherebythe gripping surfaces 22 are separated and the work can be introducedtherebetween, then on reverse movement or' the lever 10 the said pieceof work can be gripped and lirmly held between the jaw members 16 and17, -at the inner side of the pivot 19 connecting the same.l

On adjustment o'l the double links 15 by changing the position of thepivot 141, it will be noted that the jaw members can be opened or closedto a larger or smaller degree thereby accommodating various sizes ofwork, to be manipulated thereby.

1t will also be obvious thatwhen pressure is applied upon the lever 10in ak direction to grip the work maximum leverage is had and a morepositive grip action upon the work is obtained.

From the foregoing it is thought that the construction and manner ofoperation of the wrench will be clearly understood and therefore a moreextended explanation has been omitted. i y Y -What is claimed is:

A wrench comprising a pair of substantially straight, elongated jawmembers one of a greater length than the other, said j aw members havingtheir opposed tlat faces arranged substantially parallel one withrespect to the other and formed with serrated gripping faces arranged inpairs, one pair of such faces being formed at the outer end of said jawmembers and the other pair at a point intermediate the length of thelatter, pivot connections between the parallel faces of said jar membersand between the pairs of said gripping faces,'an operating handlepivotally connected to the lower end of the shorter of said jaw members,and a link pivotally connecting thelower end of the longer or' said jawmembers withV said operating" handle, the pivotal point of said linkwith said handle being disposed at a distance below the Vpivotal pointof the latter with said shorter jaw member.

In testimony whereofJ I hereunto affix my signature.

CHN MUlVIlORD

